This document summarizes a study examining the impact of increasing prices of petroleum-derived energy sources on household energy use for cooking in Ibadan, Nigeria. It finds that prior to further subsidy removal in 1993, most households used kerosene for cooking. After subsidy removal, there was a complete or partial switch to using fuelwood and other more polluting sources. Removing subsidies made commercial fuels like kerosene and LPG too expensive for most people. This led to increased use of fuelwood and associated environmental impacts like indoor air pollution and deforestation.
This year's SITE Energy Day was devoted to discussing the consequences of oil price fluctuations for markets and actors of the economy. The half-day conference engaged policy-oriented scholars and experts from the business community to discuss the impact of oil price fluctuations on macro fundamentals, international trade, strategies of oil cartels, strategic risk management, and opportunities for change in energy systems.
Luca De Lorenzo, Senior Researcher at Stockholm Environment Institute, gave a presentation "Low oil prices and the new climate economy: constraint or opportunity?"
For more information and research analysis please visit: www.hhs.se/site
Statistical Review of World Energy 2021 Full report - BPAbdelmounimTOUILEB
The COVID-19 pandemic had a dramatic impact
on energy markets, with both primary energy
and carbon emissions falling at their fastest rates
since the Second World War. Nevertheless,
renewable energy continued to grow, with solar
power recording its largest ever increase.
This year's SITE Energy Day was devoted to discussing the consequences of oil price fluctuations for markets and actors of the economy. The half-day conference engaged policy-oriented scholars and experts from the business community to discuss the impact of oil price fluctuations on macro fundamentals, international trade, strategies of oil cartels, strategic risk management, and opportunities for change in energy systems.
Luca De Lorenzo, Senior Researcher at Stockholm Environment Institute, gave a presentation "Low oil prices and the new climate economy: constraint or opportunity?"
For more information and research analysis please visit: www.hhs.se/site
Statistical Review of World Energy 2021 Full report - BPAbdelmounimTOUILEB
The COVID-19 pandemic had a dramatic impact
on energy markets, with both primary energy
and carbon emissions falling at their fastest rates
since the Second World War. Nevertheless,
renewable energy continued to grow, with solar
power recording its largest ever increase.
By analyzing macro-economic themes that are representative of energy and resource production and consumption, this report provides an overview of the near-term themes in cleantech as we see it.
10th edition of UN worldwide global GHG emission gap report.
In 10 years of producing the emissions gap report, the gap between what we should be doing and what we actually are is as wide as ever.
On the brink of 2020, we now need to reduce emissions by 7.6 per cent every year from 2020 to 2030. If we do not, we will miss a closing moment in history to limit global warming to 1.5°C. If we do nothing beyond our current, inadequate commitments to halt climate change, temperatures can be expected to rise 3.2°C above pre-industrial levels, with devastating effect.
Getting the Boom Without the Bust: Guiding Southwestern Pennsylvania Through ...Marcellus Drilling News
A research report published jointly by Washington & Jefferson College (of Washington, PA) and the Washington, DC-based Environmental Law Institute. The study supposedly analyzes and offers ways for PA communities to avoid the boom and bust cycle typically associated with resource extraction, like shale drilling. With "helpful" suggestions for local politicians with regard to the Act 13 legislation and how they can use it against shale drillers. The report was funded by the anti-drilling Heinz Endowments.
By analyzing macro-economic themes that are representative of energy and resource production and consumption, this report provides an overview of the near-term themes in cleantech as we see it.
10th edition of UN worldwide global GHG emission gap report.
In 10 years of producing the emissions gap report, the gap between what we should be doing and what we actually are is as wide as ever.
On the brink of 2020, we now need to reduce emissions by 7.6 per cent every year from 2020 to 2030. If we do not, we will miss a closing moment in history to limit global warming to 1.5°C. If we do nothing beyond our current, inadequate commitments to halt climate change, temperatures can be expected to rise 3.2°C above pre-industrial levels, with devastating effect.
Getting the Boom Without the Bust: Guiding Southwestern Pennsylvania Through ...Marcellus Drilling News
A research report published jointly by Washington & Jefferson College (of Washington, PA) and the Washington, DC-based Environmental Law Institute. The study supposedly analyzes and offers ways for PA communities to avoid the boom and bust cycle typically associated with resource extraction, like shale drilling. With "helpful" suggestions for local politicians with regard to the Act 13 legislation and how they can use it against shale drillers. The report was funded by the anti-drilling Heinz Endowments.
Dynamic Linkages between Electricity Consumption, Urbanization and Economic G...AkashSharma618775
During the last decades, the relationship between electricity consumption, urbanization and economic
growth has been well documented in the energy economics literature. In term of our present case, limited research
had been conducted for GCC countries. This study is an addition to the existing literature by empirically
investigates the relationship between economic growth, electricity consumption, and urbanization in the Gulf. A
standard growth models will be estimated using both fixed-effects and random effects models. In addition, panel
unit root and panel co-integration tests will be employed to check for the efficiency of the data. The long run
relationship is estimated using fully modified OLS and: Panel Dynamic Least Squares (DOLS) methods. Panel
Vector Error Correction Model (VECM) is also utilized in this study.
The study found that there exists a long relationship between GDP per capita electricity consumption, Urban
population, inflation, and degree of openness. The degree of adjustment was found to be 0.43 percent, meaning
that any deviation for FDI from its long run path will be corrected by 0.43 percent each year.
The main policy implication for GCC to have reasonable level of growth depends on their ability to develop and
utilize the effective use of electricity power. The study suggests that to move away from oil which is fluctuate over
time to establishing a good base for industrialization by the shift of utilizing a strict balance between electricity
consumption and urbanization rate which it doesn’t affect in the long run the climate change.
Promoting Massive Renewable Energy (RE) Projects
towards achieving Sustainable Development in Nigeria
Taiwo Benjamin
Carleton University, Canada
Presented at #naee2015
Unveiling the driving forces affecting carbon dioxide emissions in the Philip...Open Access Research Paper
Human-induced carbon dioxide emissions are the major cause of climate change. Although the Philippines’ contribution to global climate change due to carbon emissions is negligible, the trend of carbon emissions from the energy sector is increasing, with emissions expected to quadruple by 2030. Thus, this paper investigates the population factors affecting per capita carbon dioxide emissions (CO2E) in the Philippines. Multiple regression analysis was performed to determine and quantify the level of effect of its population factors such as life expectancy at birth (LEB), urban population (UP), population aging (PA), and energy use per capita (EUPC) that significantly influence the CO2E. The data used for the analysis were retrieved from the World Bank for the period 1985 – 2020. Results showed that LEB, UP, PA, and EUPC are identified as significant factors affecting CO2E. Among these significant factors, EUPC has the largest effect on CO2E (F = 338.81, p = 0.000). Additionally, PA exerts the largest influence as a driving force of CO2E from EUPC (F = 40.83, p = 0.000). The regression model based on the identified significant factors is robust and significant (F = 723.35, p = 0.000), explaining 98.94% of the variation in CO2 emissions in the Philippines. This suggests that the policymakers must consider these four variables in making actions towards reducing carbon emissions in the country.
IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) multidisciplinary peer-reviewed Journal with reputable academics and experts as board member. IOSR-JESTFT is designed for the prompt publication of peer-reviewed articles in all areas of subject. The journal articles will be accessed freely online
A Civil Society Organization and Networks Position Paper with Suggested Issue...ENVIRONMENTALALERTEA1
This position paper is an output from several CSOs engagements coordinated by Environmental
Alert with financial support from Norad within the framework of ‘Increasing access to
sustainable and renewable energy alternatives in the AlbertineGraben’ that is implemented
by WWF-Uganda Country Office
Executive Summary for the IEA's annual World Energy Outlook, the 2016 edition. The Outlook predicts natural gas use will continue to rise, while coal will continue to fall. "We see clear winners for the next 25 years, natural gas, but especially wind and solar, replacing the champion of the previous 25 years, coal," said Fatih Birol, IEA's executive director.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
What is greenhouse gasses and how many gasses are there to affect the Earth.moosaasad1975
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
1. Environmentalist (2006) 26: 99–110
DOI 10.1007/s10669-006-7480-2
Dynamics of household energy consumption in a
traditional African city, Ibadan
Ibidun O. Adelekan · Afeikhena T. Jerome
C Springer Science + Business Media, LLC 2006
Abstract In the last three decades the Nigerian environment
has experienced rapid degradation. A major contributory fac-
tor of this phenomenon is the pattern of socioeconomic de-
velopment in the country that gives little or no consideration
to environmental outcomes. An aspect of this development
is the economic policy of removal of subsidies on petroleum
products initiated in 1986 as a result of the worsening eco-
nomicsituationinthecountrywhichbegunintheearly1980s.
The result of this is that prices of commercial fuels inclu-
sive of kerosene and LPG (cooking gas) have continued to
rise beyond the reach of majority of the Nigerian popula-
tion. The paper examines the effect of increasing prices of
petroleum-derived energy sources on the pattern of energy
use for cooking in low and middle-income households and
the environmental implication in Ibadan, the largest truly in-
digenous urban centre in sub-Saharan Africa. Results show
that prior to the further subsidy removal of 1993, majority of
households sampled used kerosene for cooking. Thereafter,
a complete or partial switch in the pattern of domestic energy
consumption ensued with more households using fuel wood
and other more polluting and less efficient energy sources
for cooking. The paper recommends a transition towards
more environmental friendly energy sources for household
use.
Keywords Economic policies · Domestic energy
use · Urban households · Environment · Ibadan-Nigeria
I. O. Adelekan ( )
Department of Geography, University of Ibadan, Nigeria
e-mail: ibiadelekan@yahoo.com
A. T. Jerome
Department of Economics, University of Ibadan, Nigeria
1. Introduction
Urbanization has been a characteristic feature of most
African countries in the last few decades. In 1950, only 11
per cent of the African population was classified urban but by
2000 the urban population had increased to 37.9 per cent. It
is estimated that by the year 2015, 46.15 per cent of Africans
would be living in urban areas. This high rate of urbaniza-
tion has farreaching socio-economic and environmental im-
plications for urban centres especially in the face of current
economic crisis being experienced by African nations. Ur-
banization brings with it new behavioural patterns, which
have environmental implications in terms of the ways re-
sources are collected, distributed and used. Urbanization has
therefore become a major ecological driving force involving
vast transformations in the use of land, water, air and energy.
These are key environmental variables on which the sustain-
ability of the urban systems directly depends as they affect
the welfare and productivity of individuals, households and
communities. Shortages of these natural resources therefore
result in crisis situations.
Nigeria, the most populous country in Africa, is a clas-
sic example of a country with a high rate of urban growth.
While the country’s annual population growth rate for the
period 1970–1995 was 2.9 percent, the urban population an-
nual growth rate for the same period was 5.7 percent. In
1975, urban population constituted 23.4 percent of the total
population but by 2000, 43.3 percent of the total population
was classified as urban. By the year 2025, it is estimated
that 61.6 percent of the total population would be in urban
centres (UNCHS, 1996). This rapid rate of urbanization has
been accompanied by complex urban problems in the form
of stiff competition for land, long journeys to work, traf-
fic congestion, and inadequate supply of urban infrastruc-
tures including housing, potable water and energy which are
Springer
2. 100 Environmentalist (2006) 26: 99–110
inequitably distributed. Furthermore, increased environmen-
tal degradation as a result of various human activities, such
as fossil fuel consumption, deforestation, increased use of in-
dustrial chemicals, engaged in by the increasing population
has become a critical issue.
National economic decline has also affected all sectors
of the urban economy including the household sector. Dur-
ing the early 1970s Nigeria witnessed a period of economic
growth as a result of the oil boom. The rapid rise of the price
of crude petroleum from 1973 to 1978 brought boom condi-
tions to Nigeria and consequent rapid urbanization notwith-
standing the severe balance of payments pressures elsewhere.
However, when foreign exchange earnings declined sharply
in the 1980s due to a marked drop in the price of crude oil,
economic crisis set in. Between 1982 and 1985 the economic
situation had reached disturbing levels, which prompted the
Nigerian government to embark on measures to correct the
disequilibria in the economy. In April 1982, the civilian
federal government promulgated the Economic Stabiliza-
tion Act designed to arrest the deterioration of the economy.
More stringent exchange control measures and import re-
strictions supported by appropriate monetary and fiscal poli-
cies were put in place. In January 1986, 80 percent of the
petroleum subsidy was removed leading to an increase in the
prices of petroleum derived energy sources (Ojo, 1989). In
July 1986, Nigerian adopted a Structural Adjustment Pol-
icy (SAP), which was in response to the World Banks’ de-
mand for renegotiating its debt repayment schedule. Nige-
ria’s adoption of SAP had detrimental effects. There was
negative growth in consumption both at government and pri-
vate levels and high inflation rates reaching up to 26 per cent
during the period 1987-92. The Human Development Index
(HDI) for the country also declined from 0.31 recorded in the
period 1980-85 to 0.20 for the period 1987-92 (Federal Of-
fice of Statistics, 1992: Basic Indicators for Nigeria). Among
the specific reforms prescribed by the World Bank in rene-
gotiating its debt repayment schedule was the removal of
subsidies on petroleum and other products. This led to the
gradual removal of subsidies that resulted in the pricing of
commercial fuels such as kerosene and Liquefied Petroleum
gas (LPG) beyond the reach of majority of the population
considering the fact that income was not increased. Aweto
(1995) noted that the devaluation of major currencies in West
Africa had further increased the price of commercial fuels,
making increased consumption of commercial fuels by the
low-income people, in the rural and urban areas, a remote
possibility.
Anoutcomeofthiseconomicsituationisthechangeinpat-
tern of domestic energy consumption in households, which
has had far reaching socio-economic and environmental im-
plications. This is because energy plays a critical role in the
interrelationship among environment, development and pop-
ulation. National case studies although essential in examin-
ing the impact of policies on patterns of energy use are not
readily available. This paper attempts to fill this gap by ex-
amining the dynamics of household energy use for cooking
in relation to prices of commercial fuels in the largest truly
indigenous city in sub-Saharan Africa.
Specifically, the paper examines the changes that have
occurred over time in the pattern of domestic energy use for
cooking in low and middle-income households in relation
to changes in petroleum products pricing in the recent past.
Also, environmental impacts, in terms of indoor air pollution
and deforestation of forests and wooded land within the city,
resulting from the greater use of firewood are assessed. The
study makes some distinct contribution to the literature, as it
is the first attempt to appraise the impact of energy subsidy
removal on urban households in Nigeria.
2. Urbanization and energy use
Urbanization is an important determinant of both the quantity
and type of fuel used in developing countries. Studies have
shown that at the household level, urban domestic energy
consumption generally follows the “energy ladder” whereby
residents move from consuming less costly and less conven-
tional fuels (wood, biomass) to energy of intermediate price
and quality (charcoal, kerosene) to more expensive, highly
convenient types of energy (LPG, electricity) as their income
rise and/or habits change over time (Sathaye and Meyers,
1990; UNCHS, 1991; Smith et al, 1994; Nathan and Kelkar,
1997). Sathaye and Meyers, 1990 noted that there is a rise
in the use of kerosene with income within the lower income
groups. The key factors affecting demand of particular fuel
types include the following:
(a) the relative price of the energy form and the appliance
that it will fuel.
(b) the availability of the fuel and related appliance(s) in the
market.
(c) the disposable income of the household
(d) cultural preferences,
The combination of these factors in any human settlement
gives rise to the observed pattern of energy consumption.
Studies show that disparities in household energy use ex-
ist between rural and urban populations, between high and
low income groups within a country and among countries.
The major factors contributing to these differences are levels
of urbanization, economic development and living standards
(Dzioubinski and Chipman, 1999). Urbanization in develop-
ing countries creates more demand for energy in its cheapest
and most accessible form, fuel wood, because many rural-
urban migrants retain rural habits in relation to energy use.
The energy alternatives for many urban populations are fur-
ther restricted due to cost and inadequate infrastructure. For
Springer
3. Environmentalist (2006) 26: 99–110 101
instance, Macauley et al. (1989) showed that in India fuel
wood accounted for about 33 per cent of total energy con-
sumption and that fuel wood is negatively related to level
of income while the regression equation has a positive co-
efficient on LPG use. However, with the removal of subsidy
on LPG more higher income earners were returning to the
use of traditional fuels. Basically, firewood is the poor man’s
fuel in the rural and urban areas of India and the demand for
this source of energy is very high (Parisot, 1986). The rela-
tionship between income and fuel use is also highlighted in
the work of Leach and Gowen (1987) in which they showed
that as purchasing power increased in urban areas of India,
Pakistan and Brazil, the use of biofuels declined. Similarly,
Abakah(1990) investigated the link between real incomes,
inflation and fuel wood consumption in Ghana. Results of
the regression analysis for the study indicates that the quan-
tity of fuel wood consumed is negatively correlated to real
incomes and positively related to inflation levels.
Studies have also been conducted on patterns of energy
use in low-income households of African cities. Mascarenhas
(1999) showed that the single most important energy source
for cooking in Dar-es-salaam is charcoal with 79 per cent
of households using this energy source. Also, in Monrovia,
more than 80 per cent of surveyed low-income families used
charcoalforallofpartoftheircooking(IBRD,1981).Inasur-
vey of 5 principal cities of Senegal, charcoal was also found
to be the dominant fuel for cooking in households (World
Bank/UNDP, 1989). This pattern of consumption is largely
influenced by the lack of wood resources near most urban ar-
eas. In some other African cities, fuel wood is a common fuel
for the urban poor especially where forests are not very far
from cities. Surveys of energy use in Kenya found that fuel
wood accounted for 60 per cent of total energy consumption
among the lowest income group of urban households while
kerosene made up only 8 per cent of total consumption (Bei-
jer Institute, 1984). In Nigeria surveys of energy use have
been undertaken in selected parts of the country (Onibokun
et al., 1986; FOS, 1992; Alabe, 1996; Mendie and Sanni,
1991). A significant shortcoming of these surveys is that a
differentiation of households in terms of income groups was
not made.
3. Study area
The study was conducted in Ibadan (Lat. 7◦
32 N Long.
3◦
54 E) the largest truly indigenous urban centre in Africa
south of the Sahara. The city is located near the forest grass-
land boundary of southwestern Nigeria and represents the
pinnacle of pre-European urbanization in the country (Mabo-
gunje, 1968). Ibadan is approximately 150 kilometres north
east of Lagos, the commercial capital of Nigeria and has an
estimated total land area of about 130.50 sq. km (Areola,
Table 1 Population size and annual growth rate (%) of Ibadan city
Year Population Growth Rate (%)
1975 847,000
1985 1.1 million 2.8
1995 1.5 million 2.81
2005 2.1 million 3.34
2015 3 million 3.64
Source: UNCHS (HABITAT), 1996
1982). The location of the city contributed to its early im-
portance as a marketing centre for traders and goods from
every part of western Nigeria. By 1860, Ibadan had become
the largest urban centre of Nigeria with a population density
of 17,427 per sq. km. The rapid expansion of the city in the
last three decades has been primarily due to a spate of de-
velopment projects sited in the city between the early 1970s
and early 1980s. Apart from being the largest urban centre,
Ibadan is also the most cosmopolitan city in Yoruba land.
The pattern of land use in the city shows that the largest
use of land is for residential purpose, which occupies about
61.39percentofthetotallandinthemetropolitanarea(Ayeni,
1982). Residential land uses in the city comprise the high-
densityarea,themediumdensitydistrictsandthelow-density
residential districts. The indigenous Ibadan population and
early non Ibadan Yoruba migrants inhabit the high-density
core area. This zone is the oldest part of the city and com-
prises the older low quality residential districts. There are
hardly any spaces between the buildings, a situation causing
grave ventilation and accessibility problems among others.
Many of the buildings do not face the roads or streets since
they are at the back of other buildings. Access within the area
is, therefore, in most cases by means of narrow footpaths.
Most residents in this zone belong to the low-income class.
The newer low to medium quality, medium density residen-
tial districts comprise the newer eastern and western suburbs
as well as the post 1952 suburbs while the high quality, low
density residential districts comprise Bodija housing estate
and other government and private layouts. These three resi-
dential districts are quite distinct from one another but there
is an element of homogeneity within each district in terms
of population density, housing density, housing quality, and
the general neighbourhood conditions.
4. Research methodology
The study was carried out in two residential areas of Ibadan
city: the low-income, high density and middle-income,
medium density areas. The choice of these two income ar-
eas was based on the fact that households in these areas are
most affected by economic conditions. Studies show that
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4. 102 Environmentalist (2006) 26: 99–110
macro-economic shocks affect the poor more than the rich
who are presumably in a better position to protect their living
standards (Easterly and Fischer, 1999; Ferreira et al., 2001).
Leach (1987) also noted that there is a disparity between poor
and rich in developing countries in the sensitivity to fuel price
increases.
A household energy survey was conducted to elicit in-
formation on the pattern of domestic energy consumption
for cooking during the periods before 1993, 1993–97 and
1999 when the study was undertaken. The household ques-
tionnaire comprised two main sections. Section A consisted
of questions addressing the socio-economic characteristics
of the respondents and households sampled while section B
consisted of questions which addressed the pattern of energy
use for cooking during the three periods identified and activ-
ities associated with energy use for cooking in households
during these periods. Qualitive data related to energy use
in households was also obtained from the conduct of focus
group discussions.
Three low-income residential districts in the core area of
the city (Bere, Oje and Oja’ba) and three middle-income
residential districts (Molete, Oke-Ado and Oke-Bola) were
sampled. Man made features such as roads were used to de-
lineate the boundaries of each residential district. Seventy
questionnaire forms were administered in each district mak-
ing a total of 210 questionnaires per income group. A total
of 420 questionnaires were administered to women respon-
sible for cooking in the households sampled. Men were not
interviewed because in the Nigerian society, especially in the
southwestern part of the country, culturally it is not a man’s
responsibility to cook. The random sampling technique was
employed to choose the dwelling units where the question-
naires were administered. Only one household was sampled
in any housing unit, as there is usually more than one house-
hold in a building.
Quantitative data collected in the field were collated and
tables showing frequencies observations were compiled us-
ing the Statistical Package for Social Science (SPSS) com-
puter program.
5. Results and discussion
5.1. Trends in prices of petroleum products
The effect of the economic policies embarked upon by the
Nigerian government is that within the past one and a half
decade, a litre of petrol increased in price first from N−−−−0.60
in 1991 to N−−−−11.00 in 1994 and N−−−−20.00 in 1998 (an increase
of nearly 3000 percent in less than ten years!). Concomi-
tantly, kerosene also increased in price from N−−−−0.27 per litre
in 1993 to N−−−−6.00 in 1994 and N−−−−17.00 in 1998. While a
12.5kg cylinder gas rose in price initially from N−−−−200 in
1993 to N−−−−450 in 1998 and later to N−−−−1000 by the year 2000
(Table 2).
Tomori et al. (2005) in an assessment of the effect of some
selected macro-economic shocks on poverty showed that the
increase in prices of petroleum products impacted badly on
majority (72.9%) of poor households in Nigeria. The eco-
nomic impact on households therefore led to either a switch
in the choice of energy preferred for domestic use or a sit-
uation of energy combination by different income groups.
With regard to household consumption of energy for cooking
purposes the proportion of consumers of firewood has con-
tinued to be on the increase. This is because consumers of
kerosene especially those belonging to the low-income class,
Table 2 Price of petroleum products in Nigeria (1973–2004)
Petrol Kerosene LPG (Cooking gas)
Year Naira/litre % Change Naira/litre % Change Naira/12.5kg % Change
1973–78 0.10 — 0.08 — 31.2 —
1979–85 0.15 61.1 0.11 30.0 32.3 3.5
1986–89 0.40 158.0 0.11 0.0 40.0 24.0
1990 0.51 29.0 0.15 42.9 40.0 0.0
1991–92 0.60 17.6 0.40 166.7 80.0 100.0
1993 3.25 442.0 2.75 587.5 200.0 150.0
1994–97 11.00 238.5 6.00 118.2 200.0 0.0
1998–99 20.00 81.8 17.00 183.3 450.0 125.0
2000–01 22.00 10.0 17.00 0.0 1000.0 122.2
2002 26.00 18.2 24.00 41.2 1200.0 20.0
2003 40.00 53.0 38.00 58.3 1500.0 25.0
2004 43.00 7.5 51.00 34.2 1700.0 13.3
Source: 1. Nigerian National Petroleum Corporation, Lagos.
2. Central Bank of Nigeria: Annual Reports and Statements of Accounts, various issues.
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5. Environmentalist (2006) 26: 99–110 103
Table 3 Number of households using fuel type as first order fuel for cooking
Before 1993 1993–97 1999
Low Middle Low Middle Low Middle
Income (%) Income (%) Income (%) Income (%) Income (%) Income (%)
Firewood 13(6.2) 7 (3.3) 79 (37.6) 43 (20.5) 13 (6.2) 21 (10.0)
Charcoal 3 (1.4) 4 (1.9) 12 (5.7) 33 (15.7) — 2 (0.9)
Kerosene 189 (90.0) 142 (67.6) 93 (44.3) 72 (34.3) 182 (86.7) 41 (67.1)
Gas (LPG) 3 (1.4) 53 (25.3) — 10 (4.8) — 23 (11.0)
Electricity 2 (1.0) 1 (0.5) 13 (6.2) 8 (3.8) 3 (1.1) 5 (2.4)
Others — — 4 (1.9) 41 (19.5) — 14 (6.7)
No Response — 3 (1.4) 9 (4.3) 3 (1.4) 12 (5.7) 4 (1.9)
Total 210 (100.) 210 (100.0) 210 (100.0) 210 (100.0) 210 (100.0) 210 (100.0)
Source: Field Data, 1999
are constrained to switch over to firewood or other fuels as
an alternative energy source. Consequently, an increased par-
ticipation of both men and women in the fuelwood business
was witnessed in the city with a concomitant increase in cost
of firewood. A bundle of fuelwood that cost N−−−−25 in 1992
was sold for N−−−−50 in 1994 and N−−−−40 in 1999. This quantity
of firewood is just about enough for the cooking needs of an
average household in a day.
5.2. Household energy consumption pattern
The effect of price increase in kerosene and cooking gas
is examined by considering the dynamics of household en-
ergy consumption before 1993, between 1993 and 1997 and
when the survey was conducted in 1999. Table 3 shows the
pattern of consumption of firewood, charcoal, kerosene, gas,
electricity and other fuel sources such as sawdust, and palm
kernel residue during the three different periods.
5.2.1. Pre-1993 energy use
Before 1993, kerosene was the major fuel used by house-
holds in both the low-income and middle-income groups. In
1991, a litre of kerosene was sold for 0.40 Naira. Kerosene
was readily available at petrol stations for anyone to pur-
chase. The household survey showed that during this period
kerosene was the primary energy for cooking in both low and
middle income households of the city. Ninety per cent of low-
income households surveyed used kerosene while 67.6 per
cent of middle-income households used kerosene for cook-
ing.Thereasonsgivenforthewidespreaduseofkerosenewas
that kerosene stove did not need tending and that kerosene
was affordable and readily available. Also, the housing struc-
ture in the low-income area of the city contributed to the
widespread use of kerosene stoves for cooking. The prefer-
ence for kerosene over firewood for domestic cooking was
explained as follows:
Houses built nowadays have no kitchens. All the landlords ensure
is that the rooms are completed. And we that live in such houses
have envisaged problems with the use of firewood. There will be
too much smoke.
In middle-income areas, gas was the second important
cooking fuel with 25.3 per cent of households making use of
it as a first order fuel. Very few households used firewood,
charcoal and electricity for cooking in this area (Table 3).
In the low-income areas, firewood was the second important
cooking fuel with 6.2 per cent of households using it as a first
order fuel. The use of charcoal, gas and electricity for cook-
ing was not of significance in the low-income areas during
the pre–1993 period. During this period, 83.8 per cent and
76.2 per cent of households surveyed in the low and middle-
income areas respectively did not use other energy types for
cooking apart from the first order fuels described above. In
the middle-income area 15.2 per cent of sampled households
mentioned kerosene as a second-order fuel. These middle-
income households in most cases used gas as their primary
energy source for cooking.
5.2.2. 1993–97 energy use
In 1993, the prices of petroleum derived energy sources were
increased due to further removal of subsidies on petroleum
products. There was a 587.5 per cent increase in the pump
price of kerosene from the 1991 price. There was also marked
increase in kerosene trade by middlemen who purchased
kerosene in large quantities at petrol stations for resale at in-
creased prices to consumers. This practice resulted in scarcity
of kerosene at petrol stations and many consumers were de-
prived the opportunity of purchasing kerosene at the pump
price. The selling price of a litre of kerosene at the hands of
these middlemen ranged between N−−−−40– N−−−−50 by 1994 com-
pared with the official pump price of N−−−−6 per litre. Also,
the official price of cooking gas relative to the 1991 cost in-
creased by 150 per cent. This high cost of petroleum derived
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6. 104 Environmentalist (2006) 26: 99–110
Fig. 1 Trend in petroleum products pricing in Nigeria (1973–2004).
energy for cooking coupled with scarcity of these products
led to many households changing their energy sources for
cooking.
In both low and middle-income areas, although kerosene
wasstillthemainenergysource,theproportionofhouseholds
using kerosene as the primary source of energy for cooking
during this period reduced from the pre-1993 value (Figs. 2
& 3). The use of firewood assumed an increased significance
relative to its use before 1993 for both income groups. In the
low-income areas, 37.6 per cent of sampled households used
firewood as their primary energy source while in the middle
income area the proportion was 20.5 per cent.
Sawdust use (19.5%) was next to the use of kerosene and
firewood in the middle-income areas followed by the use of
charcoal (15.7%). The use of wood shavings and sawdust
for cooking was a major development in many households
in the middle-income districts during this period. This was
largely due to the availability of sawdust from sawmills that
were mainly located in middle density areas within the city.
Households that never used sawdust for cooking in the past
were introduced to its use. The very low cost of the stove
that was easy to fabricate at home using large-sized tins of
‘Bournvita’ or paint as well as the fact that many households
located near sawmills were able to get the woodshavings and
sawdust free contributed to its use. However, at the peak of
the scarcity of kerosene, sawdust was sold at some sawmills
but then the price was very still affordable. The introduction
to the use of sawdust for cooking was vividly presented when
a focus group discussion participant described the following:
I was attending a course in 1994/95. During this period kerosene
was very costly and I used to think of lack of kerosene at home.
I did not understand what we were being taught as my mind was
not in the classroom. One day, I asked my course mates to help
me out of this predicament. I told them “I don’t understand what
we are being taught because I don’t know what my children are
going to eat tonight. I have food but no kerosene”. They asked if I
did not know how to use sawdust. “Which is sawdust?” I asked. I
was given the knowledge including how to make the stove myself
using a large sized tin of Bournvita or paint. When I used it for
the first and then second time, I saw no use in seeking kerosene
that cost N−−−−30 a bottle. (Participant, Women’s group discussion,
Oke-Bola).
During this period, the use of gas as a primary fuel for cook-
ing changed from its former order of importance as second
position to the fourth. The use of electricity for cooking
gained some importance during this period with 3.8 per cent
of middle-income households using small electric stoves for
cooking. The use of electric water heaters was also adopted
for boiling yams, rice and beans up to a convenient point
before finishing it up on kerosene stoves.
In the low-income area, there was also a marked change
in pattern of energy use during the period. The use of fire-
wood greatly increased with 37.6 per cent of sampled house-
holds making use of firewood as a primary energy source
for cooking. Cooking gas was not used at all due to high
cost. The use of charcoal (5.7%) and electricity (6.2%) how-
ever increased. A very small proportion (1.9%) of house-
holds in this group used fuel sources such as sawdust and
palm kernel shells as the primary fuel type for cooking. Oth-
ers also used cardboards, plastics, and motor tires as fuel
sources.
The increased use of electricity by households during this
period was largely due to the perceived lower cost of elec-
tricity for cooking in relation to kerosene and gas. At this
time the energy charge for residential users was 60kobo per
kilowatt-hour. Households that used electricity were ready
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7. Environmentalist (2006) 26: 99–110 105
Fig. 2 Proportion of
households using different fuel
types as first order for
cooking.(Low income group).
Fig. 3 Proportion of
households using different fuel
types as first order for cooking
(Middle Income Group).
to incur the expense of procuring portable single plate elec-
tric cookers and water heaters whose power demands are
1.8Kwh and 1.2Kwh(50 litres of water) respectively. In prac-
tical terms, the use of single plate electric cookers is not con-
venient for large households because of the quantity of food
tobepreparedandalsoduetotheculturalpracticesassociated
with meal preparation. Furthermore, the problem of irregular
power supply that is a common feature in the country is also
a deterrent to the adoption of electricity for cooking by many
households. However, the adoption of electricity for cooking
still presented a cheaper option for cooking during this period
since the use of electricity did not require the pre-payment
of charges.
With regard to the use of secondary fuels for cooking, a
larger proportion of households relative to the pre-1993 pe-
riod used a mix of fuels. In the middle-income areas, 52.9 per
cent of households combined the use of the first order fuels
with other fuels. Of this proportion 17.1 per cent made use of
firewood as a second order fuel. Kerosene was next (13.8%),
followed by charcoal (7.6%) and sawdust (7.1%). The use
of electricity and gas as second order fuels was not signifi-
cant. In the low-income areas, 32.6 per cent of households
sampled made use of other fuels in addition to the primary
energy used for cooking. Of these, 18.0 per cent made use
of kerosene, 6.7 per cent used firewood, 5.6 per cent used
charcoal, electricity (1.1%) and other fuels (1.1%).
5.2.3. 1999 energy use
By 1999 when the household survey was conducted, the mar-
ket prices of kerosene and gas had further increased although
the products were more readily available relative to the period
between 1993 and 1997. The pattern of energy consumption
for cooking in households surveyed again changed to nearly
what obtained during the earlier periods. This was because
users had come to terms with the increase in prices and did
not find the use of alternative fuels convenient. Many house-
holds therefore reverted to the use of kerosene but with the
adoption of some coping mechanisms to reduce overall con-
sumption. For instance, before 1993, 69.8 per cent of sampled
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8. 106 Environmentalist (2006) 26: 99–110
households cooked thrice a day. This proportion reduced to
41.2 per cent and 42.9 per cent in 1993–1997 and 1999 re-
spectively.
The proportion of households making use of kerosene as
first order fuel in both low and middle income areas increased
with records of 86.7 per cent and 67.1 per cent respectively.
The use of firewood for both groups also decreased consider-
ably but did not return to the former level that obtained during
the pre-1993 period. This situation was particularly evident
among middle-income households. In the low-income areas,
the use of charcoal and gas had become virtually non-existent
while electricity use for cooking reduced from the patronage
of6.2percentofhouseholdsduring1993–97to1.1%in1999.
In the middle-income areas, the proportion of households us-
ing gas for cooking again increased (11.0%) relative to the
proportion recorded for the previous period. Although the use
of sawdust had reduced at this time, its patronage neverthe-
less continued in a small proportion (6.7%) of households.
5.3. Household expenditure on energy for cooking
The increase in prices of kerosene and cooking gas reflected
on household expenditure on energy for cooking in both in-
come groups surveyed. Results show that during the pre-1993
period a little above 70 per cent of low and middle-income
households spent between N−−−−100 and N−−−−500 monthly on en-
ergy for cooking with no household expending above N−−−−1000
on cooking fuel. With the upward review of petroleum-
product prices, about 40 per cent of low and middle-income
households spent between N−−−−501 and N−−−−1000 in the 1993–
1997periodcomparedtojustabout2%before1993.Minority
(3%) spent over N−−−−1000 on energy for cooking during the
1993–97 period (Table 4).
However, in spite of the fact that prices did not reduce in
subsequent years, it was observed that household expenditure
on energy for cooking reduced. In 1999, about 70% of house-
holds had reverted to spending between N−−−−100 and N−−−−500 on
cooking fuel monthly while the proportion of households in
both groups (9%) that spent above N−−−−501 reduced markedly.
The observed pattern of spending on energy indicates that
more households either consumed less energy for cooking in
terms of kerosene use or settled for cheaper fuels like fuel-
wood and sawdust in order to reduce cost expended. This as-
sertion is substantiated by the fact that during the period 1993
to 1997, the proportion of households that cooked thrice a day
decreased from the pre-1993 record of 69.8 per cent to 41.2
per cent. By 1999 there was no significant change despite the
fact that more households had reverted to the use of kerosene
since only 42.9 per cent of households cooked three times
daily.Also47percentofhouseholdscookedtwicedailycom-
pared to the pre-1993 proportion of 20 per cent. Either way,
the management strategies adopted by households to reduce
expenditure on energy for cooking have implications for the
environment and health status of households in the city.
6. Environmental implications
The significance of the energy sector within the broader
poverty-energy-environment-nexus is well established. Re-
liance on traditional biomass energy is particularly high in
sub-Saharan Africa, accounting in some countries for 70 to
90 per cent of primary energy supply and up to 95 per cent
of the total consumption. Even oil rich sub- Saharan African
countries continue to rely on biomass energy to meet the bulk
of their household energy requirements. In Nigeria, it is es-
timated that about 91per cent of the household energy needs
are met by biomass (Karekezi, 1999).
Production and consumption of almost any type of energy
inevitably have environmental impacts. Harvesting of fuel-
wood, in particular, contributes to deforestation, soil erosion,
and desertification. An estimated 96 million people in Nige-
ria, about three quarters of the population use fuelwood as
cooking fuel. The pressure on the country’s forests is im-
mense as 450,000 hectares of woodland are lost every year
and if current trend continues, the country’s forest resources
could be completely depleted by 2020 (Oladosu and Ade-
julugbe, 1994). Use of fuelwood as an energy source can
also contribute to the accumulation of CO2, the main green-
house gas, both because burning fuelwood produces CO2,
Table 4 Monthly expenditure on energy for cooking in households (%)
Low income Middle income
Amount
N−−−− Pre–1993 1993–97 1997 Pre–1993 1993–97 1999
< 100 25.4 14.1 20.3 24.1 12.9 19.3
100–500 73.1 48.8 69.6 74.1 42.4 70.6
501–1000 1.5 42.3 8.9 1.8 41.2 8.6
> 1000 0 2.8 1.2 0 3.5 1.5
100 100 100 100 100 100
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9. Environmentalist (2006) 26: 99–110 107
and because deforestation destroys an important CO2 sink.
In addition, use of biomass in traditional stoves exposes the
users, mainly women and children, to high levels of indoor air
pollution. Indeed, the World Health Organization estimates
that indoor air pollution tagged ‘the Killer in the kitchen’ re-
sults in 1.6 million deaths worldwide per year due to indoor
air pollution, 24% occurring in Africa alone (Warwick and
Doig, 2004). The need to effect change in household energy
consumption patterns is thus of the utmost importance given
the adverse impact current energy demand and use patterns
have on health, society, the economy and the environment.
In Ibadan, the environmental effect of the energy use pat-
tern among the urban poor, especially during the 1993–97
period is indicated in the increase in indoor air pollution and
degradation of forests within the city and outskirts of the city.
6.1. Indoor air pollution
A major problem associated with housing in low-income,
high-density areas in Ibadan includes poor indoor ventila-
tion resulting from small size of windows and inadequate
spacing between houses, which also reduces ventilation. In
the middle-income area, the housing structures are largely of
medium quality and are better spaced than those in the high-
density areas. Cooking is done largely in built-in kitchens
within the house (72.9%) in the middle-income area. Other
middle-income households (18.1%) cook in kitchens de-
tached from the main house or in open air while 9 per
cent cook on corridors within dwelling units. In the low-
income area, there are as many households cooking in built-
in kitchens (37.1%) as those cooking on corridors within
the dwelling units (37.1%). Few households (4.3%) do their
cooking outside in open space while minority (1.0%) cook in
bedrooms (Table 5). About 75% of low-income households
therefore cook indoors.
Cooking in rooms or corridors within dwelling units has
health implications for such households as occupants are
Table 5 Cooking facilities in households
Income class
Cooking space Low (%) Middle (%)
Built-in kitchen 78 (37.1) 153 (72.9)
Kitchen detached from
main house 43 (20.5) 29 (13.8)
Corridor of rooming
apartment 78 (37.1) 19 (9.0)
Inside room 2 (1.0) —
Outside in open air 9 (4.3) 9 (4.3)
Total 210 (100.0) 210 (100.0)
Source: Field Data, 1999
exposed directly to high levels of pollution as pollutants are
retained indoors. The inadequate ventilation in most build-
ings also aggravates the situation. Pollutants typically found
in biomass smoke are suspended particulate matter (SPM),
carbon monoxide, nitrogen oxides, formaldehyde and com-
pounds such as polyaromatic hydrocarbons. Burning fuel
wood therefore fills houses with smoke swirling with toxic
substances.
Responses from women interviewed during the household
survey indicated that only 109 (26%) claimed to be aware
of any environmental implication of fuel wood use. Of this
number 84 (77.1%) mentioned the effect of smoke on hu-
man health and 19.3% indicated that it blackens the walls
of buildings. During focus group discussions, however, over
90 per cent of men and women interviewed described indoor
air pollution as a major problem associated with fuel wood
use. Effects associated with fuel wood use listed include the
following:
r Smoke affects eyes causing redness, burning, irritation and
weeping.
r The use of firewood in cooking causes exhaustion, tired-
ness and headaches.
r Headaches are especially experienced when the firewood
is not well dried.
r Discomfort due to heat trapped in the house.
r Fainting especially in children.
r Clothes smell of smoke
Although all members of the household experience these
effects, women and children are especially vulnerable. Most
womennotedthatwhentheeffectsofthesmokebecamemore
than they could bear they usually stopped cooking even when
the food was not yet done. Sometimes, because of the ordeal
of cooking under a covering of smoke they became exhausted
and even lost their appetite. Both men and women noted that
the use of fuel wood in their households was by compul-
sion and not by choice because of the problems outlined
above:
We were seriously in pains and suffered much when we were
using firewood. After cooking with firewood in the evening, we
were not able to sleep well at night because the whole house was
filled with smoke.
We breathed in smoke. Even when the smoke cleared, the house
was still heated until the next day. The walls of the house were
hot. So many of the children fainted at night.
(Men’s discussion group, Foko).
The situation is aggravated by the use of wet wood, which
produces more smoke than dry wood. This smoke in inad-
equately ventilated kitchens is very harmful to health. In
2002, the magnitude of the health effects, mainly eye and
respiratory illness, of indoor air pollution from cooking with
biomass fuel was ranked the fourth largest problem in devel-
oping countries by the World Health Organization. A study of
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10. 108 Environmentalist (2006) 26: 99–110
the association of household pollutants with the outcomes of
acute lower respiratory infections (ALRI) in pre-school chil-
dren in Ibadan (Johnson and Aderele, 1992) indicated that
five out of eight deaths were from wood burning homes. The
increase in households making use of fuelwood for cooking
is set to increase the incidence of ALRI and other smoke
related infections, particularly amongst pre-school children
and women, in the city.
6.1.1. Deforestation
Deforestation of forests, forest reserves and wooded areas
within and outside the city limits has been a major outcome
of pattern of energy use in low and middle income house-
holds in Ibadan. A high proportion of the fuelwood used
within the city is obtained from surrounding farming vil-
lages such as Ijaye, Alabata and Ipoki, which are located at a
distance of about 20 kilometers or more from Ibadan city. Fu-
elwood from these villages are transported to selling points in
the city where consumers purchase them. Findings from the
household survey showed that a large proportion (82.8%)
of households that consume firewood buy from these sell-
ing points while 10.3 per cent collect firewood from natural
forests and government forest reserves. Others (6.9%) buy
and also collect firewood for use in their households. Focus
group discussions conducted at the low-income district of
Adeoyo revealed that at the peak of the kerosene scarcity
much of the fuelwood used in households in Adeoyo and the
surrounding high-density areas was collected from the Oke-
Aremo forest reserve (also known as Agala forest). This is
a government-reserved forest located near Adeoyo. Quali-
tative data obtained from focus group discussions revealed
that between 1993 and 1997 the rate of deforestation of urban
forests in the city was very high:
The trees in the Agala forest were cut down to their roots.
We even used it fresh for cooking. No one minded the
consequences—we damned the government. But the govern-
ment did not arrest us until we cut down all the trees.
(Women’s group discussion, Adeoyo).
The Oke-Aremo forest reserve was ’invaded’ by women and
children during this period. Between 1991 and 2002 the area
under forest cover in the Oke-Aremo forest reserve reduced
significantly from 49.3 hectares to 13.95 hectares (Depart-
ment of Forestry, Oyo State Ministry of Agriculture and Ru-
ral Development). Beside some infrastructure extension, the
onlyotherproximatecauseresultinginthemassivedeforesta-
tion of the forest reserve is wood harvesting for fuelwood and
charcoal production for domestic use. Other forest reserves
within the city that were deforested at this time are Alalu-
bosa and Eleyele forest reserves. The increased participation
of men and women in the fuel wood business also contributed
to deforestation of forests in the surrounding rural areas from
where fuelwood is imported into the city.
7. Policy relevance
The findings of this study have important policy implica-
tions since the upward review of petroleum product pricing
has become a recurring phenomenon to date in Nigeria. A
major goal of Nigeria’s National Policy on the Environment
(1989) with regard to energy is to reduce the negative impact
of energy use on the environment by encouraging the use of
energy forms that are environmentally safe and sustainable.
The prevailing trend of economic development with respect
to pricing of petroleum-products does not facilitate the actu-
alization of this goal. Petroleum-products pricing should be
considered as an important entry point to addressing environ-
mental degradation in the country as current prices does not
encourage the disuse of fuelwood in urban areas. It is recom-
mended that environmental related costs should be built-into
the pricing of energy sources so that kerosene becomes af-
fordable to even the low-income group. Also, the supply,
distribution and marketing systems for kerosene in low and
middle-income districts of the city and other Nigerian ur-
ban centers need to be improved. Instability is another major
feature of the pricing of these energy sources that should be
addressed. There is need for government to ensure that prices
do not keep changing, as has been the norm in recent years.
Forestry laws restricting indiscriminate cutting of trees in for-
est reserves within and around cities also have to be enforced
by proper monitoring and surveillance by forest guards.
Furthermore, Nigeria is well endowed with natural gas,
of which only a relatively small proportion is utilized while
76% is flared. There is need for the government to make
concerted efforts at developing her liquefied natural gas
projects and achieving her zero-flare goal by the year 2008.
This will greatly enhance the use of gas as a major energy
source for cooking by the middle-income group. As part of
the transition towards more efficient energy use in Nigeria,
the government in conjunction with the private sector
may consider promoting the dissemination of and markets
for clean, energy-efficient liquefied petroleum gas (LPG)
stoves to replace traditional biofuel cook stoves, expand and
improve distribution networks for other modern fuels and
energy sources through market liberalization. Perhaps, some
lessons could be gleaned from Kenya where energy sector
liberalization has led to the introduction of smaller, more
affordable LPG containers—3kg and 6kg, in addition to the
standard 13kg—and wider distribution, making LPG more
accessible to poor people.
Finally, considering the central role of housing and house-
hold energy in determining exposure to indoor pollution,
there is need for enforcement of building standards that
Springer
11. Environmentalist (2006) 26: 99–110 109
ensure adequate ventilation within dwelling units. Pro-
vision of well-ventilated kitchen facilities in residential
building plans should be made mandatory in order to
deter the practice of cooking in rooms and apartment
corridors.
8. Conclusion
A major objective of this study was to appraise the pattern of
domestic energy use in low and middle-income households
in Ibadan as a result of removal of subsidy on petroleum
products. The results indicate that the pattern of energy con-
sumption for cooking in low and middle-income households
in Ibadan has changed in response to increase in commer-
cial fuel prices over time. The study showed that there is a
relationship between the price of petroleum derived energy
sources and the choice of domestic energy used for cook-
ing in households. Also, different income groups respond
differently to increase in price of petroleum derived energy
sources.
Before 1993, kerosene was the major fuel used for cooking
in middle and low-income households. It was mainly com-
mercial food vendors and occasions that required preparation
oflargequantityoffoodsuchascelebrationsthatnecessitated
the use of fuel wood in households. However, with increase
in prices of kerosene and cooking gas in 1993, majority of
low and middle-income households switched to the use of
fuel wood and other alternative sources such as sawdust. In
1999 when the field survey for this study was conducted, ma-
jority of households had switched back to the use of kerosene
but with the incorporation of management strategies includ-
ing reduction in frequency of cooking, substitution with less
nourishing but quicker cooking foods and eating of cold left-
over or reheating previously cooked food. These strategies
helped to cushion the effect of increased prices of energy used
for cooking on household budget by reducing consumption
of energy for cooking. The proportion of households making
use of fuel wood had nevertheless increased relative to the
pre-1993 period while the consumption of cooking gas had
reduced in the middle-income areas. In low-income areas, the
use of other non-conventional fuel sources such as sawdust
for cooking gained ground.
All in all, fuelwood substitution and fuel switching seem
to be closely linked with household incomes and accessibility
more than anything else. Cost is the major reason that forces
households to stay with fuelwood as the primary base fuel. It
is also noticed that generally households go down the energy
ladder when a higher-grade fuel is not available on the market
or when they have experienced a decline in their incomes. It
appears that the present landscape of energy use will remain
unless there is a significant improvement in the income base
of urban households.
Acknowledgements This work was carried out under the Gender, Ur-
banization and Environment Programme of Mazingira Institute, Nairobi
with the aid of a grant from Sida/SAREC. An initial version of this pa-
per was presented at the 2001 Open Meeting of the Human Dimensions
Research Community in Rio de Janeiro, Brazil. We are grateful to Pro-
fessor A.O. Aweto who read the draft of the paper and two anonymous
reviewers from the journal for insightful comments.
References
Abakah, E.M.: 1990, ‘Real Incomes and Consumption of Woodfuels in
Ghana’. Energy Economics Vol. 12(3), 227-231.
Alabe, M.: 1996, ‘Household Energy Consumption Patterns in Nigeria’.
Energy for Sustainable Development Vol. 2(5), 42-45.
Areola, O.O.: 1982, ‘The Spatial Growth of Ibadan City and its Im-
pact on the Rural Hinterland’. In: M.O. Filani et al (Eds.) Ibadan
Region, Rex Charles Publications, Ibadan, 98-106.
Aweto, A.O.: 1995, ‘A Spatio-Temporal Analysis of Fuelwood Produc-
tion in West Africa’ OPEC Review, Winter 1995,333-347.
Ayeni, B.: 1982, ‘The Metropolitan Area of Ibadan. Its Growth and
Structure’. In M.O. Filani et al(Eds.) Ibadan Region, Rex Charles
Publications, Ibadan 72-84.
Beijer Institute: 1984, ‘Energy and Development in Kenya: Opportuni-
ties and Constraints’. Uppsala, Sweden, Scandinavian Institute of
African Studies.
Dzioubinski, O. and Chipman, M.: 1999, ‘Trends in Consumption and
Production: Household Energy Consumption’ DESA Discussion
paper No. 6. A discussion paper of the United Nations Department
of Economic and Social Affairs.
Easterly, W. and Fischer, S.: 1999, Inflation and the Poor. Paper pre-
sented at the Annual World Bank Conference on Development
Economics, Washington DC.
Ferreira, F., Prennushi, G. and Ravallion, M. 2001. Protecting the Poor
from Macro-economic Shocks: An Agenda for Action in Crisis and
Beyond. World Bank, Washington, DC.
FOS (Federal Office of Statistics): 1992, National Integrated Survey of
Households (NISH). Report of General Household Survey: FOS,
Lagos, 36-37.
IBRD International Bank for Reconstruction and Development: 1981,
Liberia:Monronvia Water, Power and Urban Projects. Washington,
D.C., USA, IBRD Urban Projects Department.
Johnson, A.W and Aderele, W.I.: 1992, The Association of Household
Pollutants and Socioeconomic Risk Factors with the Short-term
outcome of Acute Lower Respiratory Infections in Hospitalized
Pre-school Nigerian Children. Annals of Tropical Paediatrics Vol.
12(4), 421–432.
Karekezi, S.: 1999, Access to Modern Energy—A View from Africa.
In ‘Energy After the Financial Crisis—Energy and Development
Report 1999’. Washington, World Bank.
Leach, G.: 1987, Energy and the urban poor. IDS Bulletin Vol. 18(1),
31-38. Institute of Development Studies, Sussex.
Leach, G. and Gowen, M.: 1987, Household Energy Handout, World
Bank Technical Paper No. 67.
Leach, M.: 1994, Rainforest Relations: Gender and Resource Use
Among the Mende of Gola, Sierra Leone, Edinburgh University
Press, Edinburgh.
Mabogunje, A.L.: 1968, Urbanization in Nigeria. London University
Press, London.
Macauley, M.M., Maimuddi, P.C., Agarwal, B., and Dunkerley, J.: 1989,
‘Fuel wood Use in Urban Areas: A Case Study of Raipur, India’.
The Energy Journal, Vol. 10(3), 157–180.
Mascarenhas, O.: 1999, ‘Kigogo and Hananasif in Dar es Salaam,
Tanzania: Gender Aspects of Urbanization and Natural Resource
Springer
12. 110 Environmentalist (2006) 26: 99–110
Management’. In: D. Lee Smith (Ed.) Women Managing Re-
sources: African Research on Gender, Urbanization and Environ-
ment, Mazingira Institute, Kenya, 52–79
Mendi, A. and Sani: 1991, ‘Problems and Issues in Afforestation: A
Case Study of Fuelwood Situation in the Jos Tin Mining Region’
Paper Presented at the International Workshop on Ecology and
Societies in the history of the Sahel and Savanna. Centre for Trans-
Saharan Studies, University of Maiduguri.
Nathan, D. and Kelkar, G.: 1997, ‘Wood Energy: The Role of Women’s
Unvalued Labour’. Gender, Technology and Development, Vol.
1(2), 205–224.
Ojo, M.O.: 1989, ‘An Appraisal of the Socioeconomic Impact of Struc-
tural Adjustment Policies in Nigeria’. Economic and financial Re-
view, Central Bank of Nigeria, Lagos.
Oladosu, G.A. and Adegbulugbe, A.O.: 1994, ‘Nigeria’s Household En-
ergy Sector: Issues and Supply/Demand frontiers.’ Energy Policy.
Vol. 22, No. 6, 538–549.
Onibokun, A. et. al.: 1986, Urban Growth and Urban Management in
Nigeria with Particular Reference to Public Utilities and Infras-
tructure: Final Report. Nigerian Institute of Social and Economic
Research, Ibadan.
Parisot, R.: 1986, ‘Environmental Impacts of Food and Energy
Production in India’. Paper presented for the Food-Energy
News programme of the United Nations University of Tokyo,
pp. 42.
Sathaye, J. and Meyers, S.: 1990, ‘Urban Energy Use in Developing
Countries: A Review’ In: A.V. Desai (ed.) Patterns of Energy Use
in Developing Countries. IDRC and UNU, Wiley Eastern Ltd.,
New Delhi, 177–204.
Smith, K.R. et al.: 1994, ‘Air Pollution and the Energy Ladder in Asian
Cities’. The International Journal of Energy Vol. 18(5).
Tomori, S., Akano, O., Adebiyi, A., Ishola, W., Lawanson, O., and
Quadri, O. (2005). Protecting the Poor from Macro-economic
Shocks in Nigeria: An Empirical Investigation and Policy Op-
tions. Global Development Network Research Report on Macroe-
conomic Policy Challenges of Low-income Countries.
UNCHS (Habitat): 1991, ‘Use of Energy by Households and in Con-
struction and Production of Building Materials’ Theme paper pre-
sented to the thirteenth session of the commission on human set-
tlements Harare, Zimbabwe, 29 April - 8 May, 1991.
UNCHS (Habitat): 1996, An Urbanizing World: Global Report on Hu-
man Settlements. Oxford University Press. Oxford.
Warwick, H. and Doig, A. 2004. Smoke-the Killer in the Kitchen, ITDG
Publishing, London.
World Bank/UNDP: 1989, Senegal: Urban Household Energy Strategy,
ESMAP Report No. 96/89.
Springer